An improved design for valve operation in internal combustion type engines which incorporate an overhead cam. This invention eliminates the valve spring. In current engines of this type an overhead cam lobe provides the force to the system to open an intake or exhaust valve and a compressed valve spring provides the stored energy to force the valve back closed. This invention uses two cam lobes on an overhead cam 15, an open cam lobe 16 and a close cam lobe 17; and two geared rockers, a open valve rocker 19 and a close valve rocker 20. A valve stem retainer assembly 12 is required to always engage the valve during operation. Positive force from the lobes of the overhead cam shaft is used to both open and close an intake or exhaust valve. The key is that only one of the cam shaft lobes drives the system at a time. If the close valve cam lobe 17 is providing the force to close the valve then the open valve cam lobe 16 is not engaged with the cam. Likewise, if the open valve cam lobe 16 is actively driving the roller on the open valve rocker 19, then the close valve cam lobe 17 is not engaged. Since the open and close valve rockers are geared and engaged into each other, the rocker that is not driving the system at any given time, is being driven by it.